I fitted up the carbs today to get an idea of running angle. I'm going to fit 40 mm Dellorto pumpers and they run at a maximum angle of 40 deg's. I'll measure these and see what there at.These Amals are 1 3/8 '' and will be going on a standard head bike. The ports are much larger on these heads. You can see that maybe in the photo's. Cheers Thanks for looking. brt651